So in D&D class affects experience.
The simulationist in me desires a mechanic whereby age affects experience.
The question is then how to balance the long-lived races with the shorter-lived ones.
i.e. 100 year old elf with a 20 year old human
Our currency as it is are languages, skills, proficiencies, feats, species features, background features and attribute points.
What WotC has done for ease is negate its affect as they've done to sex to level the playing field.
With 2024 they've also removed Traits, Bonds, Ideals and Flaws etc so even from that perspective they've negated the affect that age could play in the game.
It's certainly a tricky factor to include from a balance perspective. The earlier editions had a whole bunch of ways to do that but they felt nonsensical from a logical perspective.
Its likely a fool's errand anyways since level advancement is so rapid making the world and the power levels of characters bizarre.
As in why try simulate age when there is so much non-sim already within the setting.
Apologies for the rambling post. Wasn't meant to be one just ended up as one.